Free-wheel device and back-pedal brake for cycles



Feb. 22 1927. K. MULLER FREE WHEEL DEVICE AND BACK PEDAL BRAKE FOR CYCLES Filed May 4, 1926 2 Sheets-Sheet l In Ve'hzar:

Feb. 22, 1927. 1, 15,

K. MULLER v FREE WHEEL DEVICE AND BACK PEDAL BRAKE FOR CYCLES 7 Filed May 4,-1926 2 Sheets-Sheet 2 Patented Feb. 22, 1927.

KnEIEnsEn, GERMANY.

FREE-'wfiEEL DEVICE AND BAoErEnAL BRAKE F63. c c'IJEs'.

' Lxlifnr. MfiLLER, osKnnInNsEN; ennmenighssrenoa'ro-ERrcH 11vrui.i, g,f f

Application filed'May 4, 192$,Seria1 No. 106,724, and in Germany January 17, 1925 i The invention relates to cycles, which have the free-wheel device and-back-LpedaI-brake arranged within the rim of the chain-wheel, which on its partis running freely on the hub and placed on a bearing ring, whichls rigidly connected to the frame. This latter:

bearing ring holds an elastic brake-ring, whereat a thrust collar is arranged between the chain-wheel and brake-ring.

The invention concerns a cycle of this kind, the bearing-ring of which is constructed as preserving-ring for the whole casing and fitted with projections which mesh into corresponding. grooves of the brakering. The thrust collar is constructed as toothed-ring in the teeth of which hub-pro-' jections and in-the tappet-guide of which cams of the chain-wheel are in mesh, whilst rollers are bedded in the inside surface of the thrustcollar. When back-pedaling, these rollers come out of their bearings in the sliding-surface of the thrust-collar and roll 01f on the oblique sliding surface, whereby the brake-ring is pressed together and the hub will be squeezed and braked. On arranging the rollers in the inside surface of the thrust-collar, which is designed as laterally removable toothed clutchring, these rollers on back-pedaling, roll ofl on the oblique surfaces of the thrust-collar and press the brake-ring against the hub. Thus it is attained, that the chain-wheel with free-wheel-device and back-pedal-brake can easily be fitted up in place of an ordinary chain-wheel, as it is in the direction of the axle made very fiat, because the two principal parts, namely the free-wheel-gear and back-pedal-brake are arranged one around the other in the same cross plane.

Instead of the rollers balls of course may also be employed and in case of such ball;

bearing plerclng grooves are not necessary,

and it is suflicient to apply grooves at suitable distances, as for instance 10 m/m.

The drawings give examples of two kinds of carrying out the object of the invention. Fig. 1 shows an embodiment of the invention in side view with laterally bent bearingring. Fig. 2 represents a cross section of the driving position, and Fig. 3 a cross sec.-

tion of the free-wheel running position.

Figs. 4 and 5 are the corresponding frontelevations to Figs. 2 and 3. Fig. 6 is a schematic delineation, which shows the arrangementof the rigid and movable parts in r'elationyto eachotheri back-pedal-brake. Fig; 11 shows another (The movable parts are-'indicated'as Figs;

10 shows 5 wayof carrying out :the invention, where'i.

balls are employedinstead of rollers.

. The chain-wheel (1) is bymeans'ofballbearings running freely on the hub (2) and v the bearing-ring (3). This bearing-ring is rigidly connected withtheframe (4) with the aid of a lever (5). On the bearing-ring projections (6) are provided, which are brought into mesh with the corresponding grooves of the elastic ring (7 which is projecting into the interior of the free-wheeldevice and at the same time lightly embracing the brake-hub Between the chainwheel (1) and the ring is sliding which is of particular im- (7 a toothed ring portance for the action of the freewheeldrive as well as for the back-pedal-brake.

If the chain-wheel 1 is driven by the chain, the cams 11 of the chain wheel'push against the guide 12 of the toothed ring 8 and the teeth 9 of the hub 2 are coupled with the teeth 10 in the toothed ring 8 (Figs.

2 and 4). In the free-wheel position the toothed ring 8 is on account of the stoppage of the chain wheel separated by the cams 11 of the chain wheel 1, as the cams ll press the toothed ring 8 at the score 12 of the guide 12 to the right, so that the teeth 10 of the toothed ring 8 are kept out of mesh with the teeth 9 of the hub 2.

The brake is employed by back-pedaling in this way, that therollers (14) bedded in the inside surface of the toothed ring, come out of their roller bearings (13) on account of the friction caused by the backwards motion and roll off on the sliding surface (13), which becomes more and more narrow between the'toothed ring and elastic ring; by this means the rollers (14) exert pressure on the elastic ring (7), which is therefore pressed together and at the same time squeezes and brakes the hub (2).

The rollers (14) may of course be replaced I by other parts, which are able to cause squeezing and braking of the hub (2). The

are balls (20) provided instead of rollers (14) (21) represents the spur gear, (22) the core of the casing, (28) the thrust-collar provided With teeth (2a) the elastic brake- .ring, (25) the bearing ring, (26) the closing having lateral teeth, a chain Wheel rotatable on the hub, a bearing ring rigidly connected with said frame, an elastic brake ring held 'in position by said bearing ring, a laterally toothedring interposed between'said chain Wheel and said brake ring having internal oblique sliding spaces, and rollers adapted to roll on the inside of the laterally toothed ping and press said brake ring against said 20 111 2, Ina freewheel device, a frame, a hub l'iavin'g lateral teeth, chainwheelrotatable on the hubya bearing ring rigidly connected with said frame, an elastic brake ringheld 25 in position by saidbearing ring, a laterally toothed ring interposed between said chain Wheelancl "said brake ring having internal oblique sliding spaces, and balls adapted to roll on the'inside of the laterally, toothed 30 ring and press said brake ring against said hub.

In testimony whereof I have signed my name to this specification.

KARL MtiLLERQ 

